If and elseif loop

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Stephen Mixon
Stephen Mixon 2021-7-14
回答： Cris LaPierre 2021-7-14
I am trying to say that if f1 is greater than f_st (which is .0667) then calculate T04f using f =.0667.
M = 4;
T_a = 205; %kelvin
P_a = 11.6; %kpa
Q_r = 45000; %Kj/kg
f_st = .0667; % Greater than or equal to used in if loop
T_o4 = 3000; %kelvin
r_d = (1 - (0.1 * ((M-1) ^ 1.5)));
r_fh = 0.97;
r_comb = .95;
n_n = .95;
n_comb = .98;
Me_comb = 0.5;
R = .287; %kJ/Kg*k
gamma1 = 1.4;
gamma2 = 1.3;
cp1= (gamma1 * R) / (gamma1 - 1);
% Equations
p0a_pa = (((1 + (gamma1 - 1) / 2) * (M ^ 2)) ^ (gamma1 / (gamma1 - 1)))
T0a_ta = ((1 + (gamma1 - 1) / 2) * (M ^ 2));
T02 = T_a;
p02_p0a = r_d
p03_p02 = r_fh
T03 = T02;
T04 = 3000; %kelvin
f1 = ((T04-T03) / (((Q_r * n_comb) / cp1) - T04))
if f1 > f_st
f = .0667;
T04f= ((T03 / (1 + f))+(((f / (1 + f)) * ((Q_r * n_comb) / cp1))))
elseif f1 <= f_st
T04f = T04
end

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-7-14
See Ch 13 of MATLAB Onramp to learn about if-else statements (they are not loops).
Can you clarify what is or isn't happening that you expected?
In your case, you could use an if-else statement.
if f1 > f_st
f = .0667;
T04f= ((T03 / (1 + f))+(((f / (1 + f)) * ((Q_r * n_comb) / cp1))))
else
T04f = T04
end

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